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by Procheta Mallik

Introduction

In this guide, we will explore how to use a magnet to make objects magnetic. We will further explore how to demagnetise what has been magnetised!

Video Overview

    • Burning or heating should be carried out with adult supervision.

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  1. In order to  better analyse  the changes after your experiments, let's start by noting the properties of the magnet and nail. To do this, pour out a small heap of iron filings on a sheet of paper.
    • In order to better analyse the changes after your experiments, let's start by noting the properties of the magnet and nail. To do this, pour out a small heap of iron filings on a sheet of paper.

    • The magnet attracts the iron powder while the nail does not.

    • Furthermore, the nail (being mostly iron) is also attracted by the magnet.

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    • Stroke the iron nail with one of the faces (poles) of the magnet.

    • Do this about 30-40 times. Make sure to stroke the magnet in only one direction, always with the same side (pole) of the magnet. Once the magnet reaches the end of the nail, lift it away from the nail when bringing it back to the initial position.

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    • To test if the nail is magnetised, plunge it into the iron powder. The iron powder should now be attracted to the nail! (albeit weakly)

    • More stroking with the permanent magnet will increase the strength of the magnet being made, in this case the iron nail.

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    • Wrap a length of binding wire on an ice cream stick .

    • Wrap the other end of the wire to the head of the nail. This will make the nail easy to hold over a flame.

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    • Using the ice cream stick, suspend the nail over a lit candle. Do this for about 10-15 mins (Till the nail glows dull red).

    • The temperature above which a material loses its permanent magnetic properties is called its Curie temperature or point. Since the Curie point of iron is 770 °C, excessive heating is required to effectively demagnetise it.

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    • Once the nail has cooled plunge it into the iron powder again.

    • The iron powder should no longer be attracted to the nail. It has then been effectively demagnetised!

    • In case the nail still attracts the filings, heat the nail longer and/or do so on a hotter flame, e.g. gas stove

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    • If the nail is already magnetised at the start, demagnetise it by heating first.

    • If the nail is not demagnetised by the heating, the nail has not been heated enough. Try prolonged heating, and/or heating on a hotter flame .

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Finish Line

Suhail Ahanger

Member since: 05/02/2017

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